Metal-Organic Framework MIL-53(Fe) as an Adsorbent for Ibuprofen Drug Removal from Aqueous Solutions: Response Surface Modeling and Optimization

Table 1

List of independent variables and their levels.

Factors	Unit	Code	Levels
			−α	−1	0	+1	+α
Initial concentration	mg/L	x1	1.6	5	10	15	18.4
Adsorbent dosage	g/L	x2	0.16	0.5	1	1.5	1.84
pH	—	x3	2.6	4	6	8	9.4